I wasn't sure about the composition of the lower part of the image and as a result, I made some variations there. I put some sample textures on those variations and then compared the original with the variations. It was like a study in traditional painting (Fig.04).

Fig. 04

The final model can be seen in Fig.05. The image was rendered in Callisto, which is Shade's renderer, and the only light source I used was a skylight. I also used a soft shadow, and applied further contrast and tweaked the color tones in Photoshop.